Zusammenfassung
Die Leber ist ein Organ mit einzigartigem immunregulatorischen Potenzial. In dieser
Arbeit wird die experimentelle Evidenz dargestellt, die für die Beteiligung hepatischer
Zellpopulationen an der Induktion von oraler Toleranz spricht. Obwohl die Induktion
von Immuntoleranz gegenüber oralen Antigenen vor allem im lymphatischen Gewebe des
Gastrointestinaltraktes erfolgt, besteht ein weiterer Bedarf für die Aufrechterhaltung
peripherer Immuntoleranz außerhalb des Gastrointestinaltraktes, da orale Antigene
innerhalb von Minuten nach Aufnahme schnell über den Blutstrom systemisch verteilt
werden. Neben hepatischen dendritischen Zellen sind vor allem sinusoidale Endothelzellen
der Leber an der Aufnahme von oralem Antigen aus portalvenösem Blut und der Kreuzpräsentation
dieser Antigene auf MHC-I-Molekülen für CD8-T-Zellen beteiligt. Die Folge der Kreuzpräsentation
oraler Antigene durch sinusoidale Endothelzellen der Leber ist die Induktion von CD8-T-Zell-Immuntoleranz.
Diese Befunde unterstreichen die Bedeutung der Leber in der Aufrechterhaltung peripherer
Immuntoleranz auch gegenüber oralen Antigenen.
Abstract
The liver is an organ with unique immune regulatory potential. This review highlights
the experimental evidence for the involvement of hepatic cell populations in the induction
of oral tolerance. Although immune tolerance towards oral antigens is mainly induced
in the gastrointestinal tract within gut associated lymphatic tissue via generation
of regulatory CD4 T cells, there is a further need for tolerance induction outside
the gastrointestinal tract, because oral antigens rapidly distribute within minutes
systemically through the blood stream. Besides hepatic dendritic cells, liver sinusoidal
endothelial cells are active in the uptake and cross-presentation of oral antigens
from portal venous blood and engage in the induction of CD8 T cell tolerance towards
these antigens. These reports strengthen the notion that the liver participates in
the induction of oral tolerance.
Schlüsselwörter
Sinusoidale Endothelzellen der Leber - hepatische dendritische Zellen - Antigenaufnahme
- Kreuzpräsentation - Immuntoleranz
Key words
Liver sinusoidal endothelial cells - hepatic dendritic cells - antigen uptake - cross-presentation
- immune tolerance
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MD Percy A. Knolle
Institute for Molecular Medicine and Experimental Immunology, Friedrich-Wilhelms-University
Bonn, University Hospital
Sigmund-Freud-Str. 25
53105 Bonn
Phone: ++ 49/2 28/2 87-10 50
Email: Percy.Knolle@ukb.uni-bonn.de